Best reality testing situations

[SupersecretIdentity]

I just had a lucid dream last night which has re-jump started my interest to try and seriously learn to lucid dream. Just like the last lucid dream I had a few months ago, I found myself able to hold my breath ridiculously long and actually breathe while underwater. I recognized this as a dream sign from before, and did my favorite reality check test (breathing through my pinched nose).

From what I understand (and what resonates with me best) is that the best way to become a proficient lucid dreamer is to condition yourself to frequently reality test so that you have a greater chance of attempting it while dreaming.

I know that I need to be a lot better about keeping a dream journal and recognizing my common dream signs, but my question is what times/situation in everyday life are best to do reality checks? I have heard of checking every time you walk through a door, but I find myself forgetting to do that, or being in too much of a hurry to bother.

For anyone who uses this method? What situations have you conditioned yourself to reality test?